Variable speed rotary motion transmitter



April 12, 1932'. c. s. CARLBERG 1,354,018

VARIABLE SPEED ROTARY MQTION TRANSMITTER Filed Oct. 8, 1930 2Sheets-Sheet l 'lll April '12, 1932- Q c. s. CARLBERG 1 1,854,018

VARIABLE SPEED ROTARY MOTION TRANSMITTER Filed Oct. 8, 1930 2Sheets-Sheet 2 v BY/fVO/iWEXS.

- cm s. oABLBEaG.

Patented A r. 12, 1932 UNITED STATES PATEN'P OFFICE OI MO UND,MINNESOTA, ASSIGNOB OI ONE-HALF TO DAVID E.

KABLIBERG, OF TBENTON, NEW JERSEY VARIABLE SPEED BPTARY MOTIONTRANSMITTER Application fled October a, 193o.- Serial no; 481,222.

My invention has for its object to provide an improved variable speedrotar mot on transmitter, and, to this end, my inventlon consists of thenovel devices and combinail tions of devices hereinafter described andpointed out in the claims. Y

My invention in its preferred form is lllustrated in the accompanyingdrawings, wherein like notations refer to 11ke parts through-.

out the several views. o

In said drawings Fig.1 is a front elevatlon illustrating my invention asapplied to transmit at variable speeds the rotary motlon'of the rotatingpart of an electric motor Fig. 2 is a view chiefly in end elevatlon butpartlyin section on the line 2-2 of F1g. 1; Fig. 3 is a horizontalsectlon on the line 3-3 of Fig. 1;

Fig. 4 is a vertical section on the line 4-4 of Fig. 3;

Fi 5 is a vertical section on the hne 5-5 'of Fig. 3;

Fig. 6 is a horizontal secition on the line 6-6 of Fig. 1 and Fig. 7 isa vertical section on the l1ne,7-7 of Fig. 6. v

- The numeral 8 represents an electric motor of any standard or suitableconstruction. The rotating element of this electric motor, which, inthis case, will be assumed to be the armature, has its shaft extendedoutward at one end to afford a projecting part thereof, which "is markedwith the numeral 8a, on which some of the elements of my transmitter aremounted, as will presently be noted. The casing of themotor 8 is shownas provided with two pairs of spacing spools 8b PI'OJBCting outwardtherefrom parallel with the projecting portion 8a of the armature shaft.Two of these spools 81) project from near the bottom of the casing, inline with each other, and the other two project from nearthe top of thecasing. in line with each other, as clearly shown in Figs. 1 and 2 ofthe draw- The numerals 9 represent a pair of horizontal bars providedwith horizontal slots 9a near their opposite ends, and the numerals 10represent headed bolts, the stems of which work through the slots 9a andare tapped into the spools 86 for adjustably securing the said bars 9 tothe said s ools, and,

through. the latter, to the casing o the motor 8. The numeral 11represents an n right bar provided with vertical slots 11a an 11b. Thenumerals 12 represent a pair of nut-equipped bolts, one of which worksthrough the slot lla, and the other through the slot 116 for adustablysecuring the said bar 11 to the two orizontal bars-9. The saidv two bars9 and the vertical bar 11, taken together, constitute a supportingbracket for some of the ele-v ments of my transmitter. The vertical bar11 is of such length that it extends upward beyond the top of the motor,and has a vertical slot 110.

On the projecting part 8a of the motors armature shaft is directly, orindirectly mounted elements which co-operate to afford a prlmary pulleyand a deliverypulley. These pulleys are both shown as of the conicalflange type and are each diametrically divided into two sections whichare axiall adjustable in orderto make the flanges o the respectivepulleys engage the belt at different radial ihstancesfrom the axes ofthe respective'puleys.

The numeral 13 re resents a horizontal stud shaft removably ed to the upportion of the vertical bar 11 with its axis overlying and parallel withthe axis of the PIOJGCtlIlg part'8a of the motors armature shaft; andthis stud shaft 13 has mounted thereon and fixed thereto, a slottedsleeve 14, upon which is indirectly mounted, elements which co-operateto afford two conically flanged counter pulleys, each diametricallydivided into two sections which are laterally adjustable in respect toeach other in order to make the flanges ofthe pulleys engage the r endand bled; These detailswill now be ulle'y and delivery specified. Therima own i i ig. 6 of the drawpulley are best The co-operative sectionsof the primary P y 16, respectively. The section 15 is provided with'anenlarged hub 15a mounted directly onthe projecting portion 8a of themotors armature shaft and adapted to be rigidly connected therewith by a"am screw 15?), and,

hence, this sectio1i15a will be driven by the 7 motor shaft, at someconstant predetermined shrunk together.

Iii) speed. The said hub of the section is also rovided with an axiallyprojecting shaftike portion 150 on which is mounted the pulley section16 and the lower members of a ball race track 17, which parts arerigidly connected to ther. As shown, said two parts shoulders which areare join by lap I aid section 16 also carries profileldowels lfia'whichwork through holes mthe sec 'on 15 and so connect the sections 15 and-.1that they must always turn together. The numerals 18 represent theballs, and the numeral 19 the upper or outer sections of the race track.The numerals 20 and obvious that the pulley member 20, with the outertrack 19, will rotate on the balls independent of the rotation of themembers 15 and 16 making up the primary pulley. The

member 21 of the delivery pulley has its body portion shouldered, andmounted on and secured to the upper track 22 of another ball race, thelower track 23 of which is mounted in' a recessed part of the stud shaftportion 150 of the section 15 of the primary pulley. section 21 of thedelivery pulley extends inward and below the balls 24 and embraces ashouldered part of the inner track 23, and a retaining disk 25 isclamped against the outer ends of the said tracks by a headed screw 26tapped into the end of the shaftlike' projected portion 150 of thesection 15 of the primary pulley, as clearly shown in Fig. 6. In virtueof this mounting of the section 21 of the delivery pulley, it is obviousthat it, and the upper track 22 of the ball race, willfturn on the balls22 independently of the rotation of the primary pulley. The

section 20 of the delivery pulley has profile dowels 27 which passthrough holes in the are marked with the numerals 15 and One wall of therecessed part of the member21, thereby connecting the sections 20 and 21so they will always rotate together. The pulley sections 16 and 20 andthe ball track sections to-which their inner ends are connected areloose on the laterall projecting or'stud shaft portion 150 of t e hub ofthe section 15 of the primary pulley, and, hence, may move laterallythereonand for this reason the said sections 16 an may be termedfloating sections, the purpose of which will hereinafter appear.

Directing attention now to the elements of my transmitter which aremounted on the sleeve 14 carried by the stud shaft 13 fixed to theupright .bar 11 of the supporting bracket for'the transmitter, it hasalready been noted that the sleeve 14 is longitudinal- 1y slotted. Theseslots are opposite to each other, as best shown in Fi s. 3and 4 of thedrawings, and both marke with the numeral 28.- In said sleeve 14 are apair of nuts marked respectively 29 and 30, having webs which extendradially outward through the s'aid slots and travel therein. The outerpor-,

tions of said nuts 29 and 30 are shouldered on their profile faces andrecessed'on their peripheries, thereby adapting the same to serve as theunder members of ball race tracks in which are mounted balls 31. Theouter members 32 of the ball race tracks are held by curved retainingtroughs 33 of channel shape in cross section. The inner edges of thesechannel walls embrace the shouldered outer portions of the lower tracksections atforded by the outer portions of the nuts 30, hitherto noted.

The numeral 34 represents an annular track section mounted with freedomfor sliding motion on thesleev'e 14, and recessed on its periphery toaflord seats for balls 35. The numeral 36 represents'outer tracksections for co-operation with the inner track section 34, and thisouter track is embraced by a curved trough-like retainer 37 of channelform in cross section, the inner flanges of which also embrace theshouldered outer-portion of the inner race track 34. The numeral 38represents an open ended cylinder which serves as a pulley body and isswaged fast to the channel shaped curved troughs which house the two endball race tracks shownvin Fig. 3 of the drawings. In other words, thecylinder 38 is swaged to the end trough. 33 and the end trough 37; and,it follows, of course, that the said cylinder or pulley body 38 will.turn with the said tracks on the said balls. The

said cylinder 38 is provided, at itslongitudi- Flg.

- and which respectively co-operate with coni-' cal pulley flanges 42and 43 formed integral with the cylinder 38. The said cone 41 and thesaid pulley flanges 42 and 43 extend .en-

' tirely around the cylinder 38, and rotate and 446, which,respectively, engage the right therewith. Y

The numeral 44 represents a manual screw shaft provided with right andleft screw threaded portions marked respectively 44a and left screw nuts30 and 31;. and, it, of course, follows that when this screw shaft 44is" turned, it will'move the nuts 29- and 30 in opposite directions andthereby cause the pulley sections to approach or separate from eachother. Said screw shaft 44 1s held from longitudinal motion by a handpiece 45 of disk-like form removably fixed to the end of said shaft andreacting against balls 46 spring seated in a reaction block 47 ofdisklike form removably secured to the fixed non rotative sleeve 14. Theend of the slotted sleeve 14 is filled by a filler block 14a fixed tothe sleeve by screws 141), as shown in Figs. 3 and 5. This block 14aaffords a bearing for the screw. shaft 44 and braces the on of thesleeve.

- Two round'belts are em loyed to connect the respective pairs of puleys so far noted. These belts are shown in Figs. 1 and 2 of the drawingsand marked, respectively, 48 and 49. The stud shaft 13 is adjustablclamped to the upright bar 11 by a nut 13 engagm the screw-threaded endof said stud sha which extends through the slot 110 of said bar 11. Thismounting of said stud shaft enables the same, and the counter .ulleythereon, to be .vertically adjusted for tightening the belts specified.The operation of the mechanismwhenever needed.

As illustrated, in the drawings, the ri h hand or outer section 21 ofthe delivery pul ey has secured thereto by screws 50a a stepped pulley50 with flanges which cooperate with the outer surface of the pulleysection 21 to afford three steps of different diameter for theapplication of transmitting belts, not shown. The said stepped pulleybeing in that location, is provided with a tool holding hub 51 to whichany desired tool maybe secured in any suitable way. As shown, the hub isadapted to receive one end of a shaft 52 held therein by a jamb screw 53and which, at its outer end, is shown in Fig. 1 as provided with anemery wheel 54.

The illustrated parts have now all been considered as an entirety,without much-reference to the details of the structure,-may besummarized as follows Assume that the motor is in action and driving itsarmature shaft at some predeterget I the sai' reduction of speed, ascompared with the tions of the pulleys would be in the position shown inFi s. 1 and 2 of the drawings. To arts into the position. there shown,it we have been necessary to take hold of the hand piece 45 of the screwshaft 44 and turn the same in such a direction that the sliding sectionsof the pulleys on the counter shaft would be separated from theircooperatin sections 'to the la est extent. If it'shoul be assumed thatFig. 3 shows the pulley sections of the counter shaft in what might becalled a normal or neutral position, at which they would simp. transmitthe speed of the armature sha t without any change therein, then itwould be necessary to turn the worm shaft 44-clockwise to separate thesliding sections of the pulleys on the counter shaft and bring the partsinto the ositions shown in Figs. 1 and 2. When t 's separation has takenlace, the primary belt 48 will be enga ed by t e co-operating flanges ofthe first pul ey of the counter shaft at the greatest available radialdistance from the I axis of said counter shaft pulle and theco-operating flanges of the secon pulley on the counter shaft willengage the secondary belt49 at the shortest available radial distancefrom the axis of the secondary pulley on said counter shaft, and saidsecondary b'elt will engage the co-operating flanges of the deliverypulley at the greatest available radial distance from the axis of thatpulley, thereby iving two reductions of the rotary motion rom thearmature shaft. The lateral adjustments of the sliding members of thepulley flanges on the counter shaft are positively efl'ected'by themanually operated worm shaft; but, after this is done, the pull of thebelts will make the necessary lateral adjustment of the laterall slidingmembers of the primary pulley an the delivery pul ley. In other words,these particular slidloo rections and thereby maintains alinement of thebelts in relation to the and the'delivery pulley.

The belts 48 and .49 are of the same length and are not extensible. Whenthe cooperating flanges of the first counter pulley are brought closertogether by the manipulation primary pulley of the worm shaft, so as tomake them engage the primary belt 48 at a greater radial distance fromthe axis of said pulley, the coopice crating flanges of the primarypulley, which of said worm shaft, the flanges of the priflanges on agethe said belt at a greater radial,

mary pulley will be drawn nearer together under the pull of that belt soas to make said distance rom the axis of that pulley. The same remarksapply in substance to the coopcrating flanges of the second counterpulleyrelative to the secondary belt 49 and its effect on the cooperatinflanges of the delivery pulley; but these a justments take place in anorder which is the reverse of the above named adjustments of the pulleyflanges which engage the primary belt 48. In virtue of this compensatinaction of the respective pairs of pulleys w ich engage the saidrespective belts 48 and 49, the span of each belt is constant.

' So far in tracing the operation of the illustrated mechanism, thestepped pulley 50 has been ignored. It must be obvious, however, thatthe presence of this stepped pulley 50 enables the motion of thedelivery pulley to be further changed by the a plication of atransmitting belt (not shown to a selected one of the three steps madeavailable by the pres ence of that pulley. As already noted, the toolholder 51 is shown as formed on the hub of this stepped pulley 50..

With this pulley 5O taken into consideration, along with other parts ofthe mechanism,

it must beobvious that I have provided a rotary motion transmitter whichwill make many variations in the speed at which the rotary motion of themotors armature shaft may be transmitted to any point desired. It

must also be noted that the variations in the speed available from thetwo sets of flanged pulleys and the two belts cooperating with the saidtwo sets of flanged pulleys may be finely graduated by the propermanipulation of the worm shaft 44.

It should be further noted that, if the mechanism be so designed thatthe neutral or normal point at which the cooperating flanges of therespective counter pulleys be midway of the possible radial adjustmentavailable for the grips of the belts, then this mechanism may beutilized (a) to transmit the rotary motion of the motors armature shaftat the same speed, or (b) at a decreased speed, or'

the forms and proportions of the parts may be varied without departingfrom the spirit of my invention herein disclosed and claimed.

What is claimed is:

1. The combination with a primary shaft and a primary pulley turningtherewith and a delivery pulley loose on said primary shaft, of acounter shaft having a pan of connected pulleys on a common hub looselymounted on said counter shaft, all of which ulleys are conically flangedand diametrically dlvided and the sections of which pulleys may be lat-.

erally ad'usted'in respect to each other and a pair 0 belts, one ofwhich connects said primary pulley with one of said two connected pulles loose on the counter shaft and the other 0 which belts connects theother of said counter shaft pulleys to the delivery pula pair, of belts,one of which connects said primary pulley with one of said two connectedpulleys loose on the counter shaft and the other of which belts connectsthe other of said counter shaft pulleys to the delivery pulley loose onthe said primary shaft, and a stepped pulley mounted to rotate with saiddelivery pulley, substantially as described and for the I purposes setforth.

3. The combination with a primary shaft and a counter shaft spaced apartfrom each other, of a primary pulley fixed to said primary shaft and adelivery pulley loose thereon, a pair of connected pulleys on a commonhub loosely mounted on said counter shaft, all of which pulleys haveradially tapered belt-engaging surfaces, and allof which pulleys arediametrically divided into sections axially adjustable in respect toeach other,

and two parallel, laterally adjacent belts, one of which connects saidprimary pulley with one of said two connected pulleys loose on thecountershaft, and the other of which belts connects the other of saidcounter shaft pulleys to the delivery pulley loose on said primaryshaft, substantially as described and for the purposes set forth;

4. A variable speed rotary motion transmitter comprising a primary shafthaving a primary pulley fixed to turn therewith and a delivery pulleyloose thereon, a counter shaft having a pair of connected pulleys on acommon hub loosely mounted on said counter shaft, all of which pulleyshave radially tapered belt-engagingsurfaces/and are diametricallydivided', and the sections of which pulleys are laterally adjustable inrespect to each other, manual means for axially adjusting the pulleysections on the counter shaft in respect to each other, and twolaterally adjacent parallel belts one of which connects said primarypulley with one of said counter pulle"s, and the other of which beltsconnects the other of said counter pulleys to said delivery pulley onsaid primary shaft, substantially as described and for the purposes setforth.

In testimony whereof I afiix my signature.

CARL S. CARLBERG.

